<PRE><B>Question 379058</B>
are there 362880 distinguishable arrangements of the letters in the word TEXTBOOKS? explain.
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# of permutations = 9!/[2!*2!] = 362880/4 = 90720 
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Ans. to the question is NO.
Why? Because the TT and the OO are indistinguishable letters so they
do not add to the numbers of distinct arrangements.
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Cheers,
Stan
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